Development and Evaluation of a Joint Tactical Radio System Waveform for  Asset Tracking and Data Relay Applications, 16-9407

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Principal Investigator
Melissa Wallis

Inclusive Dates:  07/01/03 - 01/01/05

Background - The Department of Defense is migrating to a software radio approach to support the next generation of mobile communications with the acquisition of the Joint Tactical Radio System (JTRS). The JTRS will be a secure (encrypted) multiband, multimode, multichannel software radio family supporting a broad range of requirements. JTRS supports the acquisition and fielding of software-defined radios (SDRs) that provide interoperable communications through an internationally endorsed open Software Communications Architecture (SCA). The JTRS will replace older hardware-intensive radios with SDRs, in which software applications provide waveform generation and processing to include encryption, filtering, and other major communication functions. A major JTRS tenet is the easy insertion of advanced technology. Abstraction of the software from the hardware allows software modules to be upgraded and new capabilities to be added with minimal impact on hardware. The JTRS software communications architecture and approach to waveform applications enable porting of waveforms across radio platforms.

Approach - At the heart of the technical approach is the development of a software radio testbed system. The testbed hardware suite will be designed and integrated using commercial off-the-shelf (COTS) hardware. The Signal Intercept from Low Orbit (SILO) beacon waveform software will be designed and implemented using the SCA as a set of rules that constrain the system design. The software design will be based on an object-oriented approach using C++, Unified Modeling Language (UML), eXtensible Markup Language (XML) and Common Object Request Broker Architecture (CORBA). Finally, the waveform implementation will be tested on the software-radio test bed to assure the system will reliably meet performance specifications.

Accomplishments - A shareware Linux Core Framework (CF), which is a government-owned SCA Core Framework was installed and successfully tested on the test-bed using a sample waveform. A MATLAB version of the SILO waveform modulation and demodulation was developed. To further test the hardware and CF, a prototype "Hello World" application that is SCA compliant that runs in combination with the sample waveform provided with the Linux CF was developed and successfully tested. Software design documentation including requirements, UML diagrams and XML has been generated. Finally, source code has been developed for the SILO waveform, the GPS receiver and the WaveRunner board that is SCA compliant. Work currently under way includes testing the transmission and receipt of the SILO waveform.

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